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<?php $input = 'あaいb'; $bytes_length = 10; $encoding = "ISO-2022-JP"; $converted_str = mb_convert_encoding($input, $encoding, mb_internal_encoding()); $cut_str = mb_strcut($converted_str, 0, $bytes_length, $encoding); $reconverted_str = mb_convert_encoding($cut_str, mb_internal_encoding(), $encoding); var_dump($reconverted_str);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.14 - 8.1.34, 8.2.1 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
string(4) "あa"
Output for 8.1.0 - 8.1.13, 8.2.0
string(5) "あa?"

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